pendleton



(No Model.) 2 S11eetsSheet 1.

J. M. PENDLETON.

ELECTRIC ARC LAMP.

No. 307,584. Patented Nov. 4, 1884.

2 Sheets-Sheet 2.

(No Model.)

J. M. PENDLETON.

ELECTRIC ARC LAMP.

No. 307,584. Patented Nov. 4, 1884.

UNITED STATES PATENT OFFICE- JOHN M. PENDLETON, OF NE\V YORK, N. Y., ASSIGNOR TO THE EQUITABLE ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAMP.

(SPECIFICATIQN forming part of Letters Patent No. 307,584, dated November 4, 188%.

Application filed February 18, 1884. (No model.)

To all whom it may concern.- matures tending to move them in front of the Be it known that 1, JOHN M. PENDLETON, a thickest part of the polar projections. citizen of the United States, and a resident of Thirdly. It consists of the arrangement of a New York, county and State of New York, coarse-wire magnet included in the arc cirhaveinvented certain new and useful Improvecuit, and a fine-wire magnet in a derived cir- 55 ments in Electric-Arc Lamps, of which the folcuit, the respective armatures of which are lowing is a specification. secured to the ends of the pivoted frame. The This invention relates, first, to an improved elongated poles of the magnet are so located method of operating and regulating electricas to be on the same sides of the armaturcs,

are lamps, which consists in suspending an anthereby applying all strains in a direction at 60 nular clamp from a pivoted frame, through right angles to the axis of the frame and on which and the clamp the carbon rod passes. one side of its bearings, thus causing the ar- The clamp is suspended from one side of the matures to maintain the same relative distance axis of the frame and the carbon rod, and is from their magnets should there by any play controlled and governed by means of a pendof the frame on'its pivots or bearings, so that 65 ent rod provided with two adjustable stops the differential action of the two magnets on V A connected to the pivoted frame on the other the frame is constant.

side of its axis and the carbon rod.- The lower The invention further embraces certain imstop acts on the under side of the free tail-piece provements in construction, which will be of the clamp to raise the same in relation to hereinafter explained in the following descrip- 70 its position on the rod as the clamp and rod tion of the accompanying drawings, in which are lowered by the downward movement of Figure 1 is a front elevation of an electricthe side of the lever to which the clamp is susare lamp, showing my improvements, with pended, and so allows the carbon rod to feed the lower part in section. Fig. 2 is a sideeledownward, and the upper stop, by coming in vation of the feeding mechanism. Fig. 3 is a 75 contact with the upper side of the free tailplan view of the same. Fig. i is an enlarged piece of the clamp, determines the height to view showing the annular clutch in its open which the carbon is raised to form the are when position, and Fig. Sis a plan view of thelowerthe pivoted frame moves in the opposite dicarbon-holding device. Figs. 6 and 7, Sheet rection. The pivoted frame is also provided 2, are respectively a part elevation and an 80 with an adjustable stop, which, by coming in inverted plan of a modification in the 0011- contact with a fixed part of the apparatus, struction of the lamp. prevents the further movement of the frame The main frame consists of the plate a, the and clamp when the clamp is operated to re arch a, the tubular side bars, a a", connected 5 5 lease the carbon rod in case of an abnormal to the plate a, but electricallyinsulated there- 8 5 current through the fine-wire magnet. from, and the bottom plate, a, secured to the Secondly. The invention relates to the conlower end of the side bars, a a struction of the electroanagnets and arma- Between the pointed bearings b 7), fitted turcs, whereby the armature in its movement in insulated plugs on the arch a, is held the 40 is caused to be always within a strong magframe or lever 21, through which theupper-car- 9o netic field by being maintained at a constant hon-holding rod 0 passes. Said rod 0 also distance from one side of elongated polar propasses through guide-bearings in the arch a jections of the magnet asittravels from the end and plate a, which are also insulated. Theof said projections upon an increase of current annular clutch cl, surrounding the rod 0, has

or toward the end of said projections upon a two tail-pieces or extensions, (1 d, and is sup- 5 diminution of current flowing through the coils ported from the lever b by means of the link ofthe magnets. This is accomplished by makc on the opposite side of its axis to that occu ing the said polar projections tapering in form pied by the carbon-rod c, and to the other arm, from where they leave the surrounding coils if, of the leveris pivoted the rodf, the lower to their ends, the magnetic induction on the arpart of which fits freely in an insulated plugin 10o theplate a. This rod f passesthrough an elongated hole in the free tail-piece d of the clamp. and on it are fitted the adjustable stop-nuts f and f The armature g of the coarse-wiremagnet 72, which is in the arc circuit, is securedto the end of the arm Z) of the lever in front of the elongated taper poles it, the adjacent faces of the poles being concentric to the axis of the lever 12, and on the end of the other arm ofthe lever b is adj ustably secured the armature z'of the fine-wire magnet j, included in a derived circuit. The poles j of this magnet are also elongated and tapering, and are located inside the arinature 2', their outer faces being curved concentric to the auns of the lever I). This end of the lever bis weighted, so that when in its normal position the stop 7.: rests on the insulated contact-plate on the end of one of the spools of the magnet j, as shown in Fig. 4.

To allow for lateral adjustmentof the lower carbon, Z, and to maintain a perfectinsulation of the frame of the lamp from the working parts, the socket m rests on the metal plate m, between which and the bottom plate, (6, of the frameis placed the washer of insulating material. a, said plate m being held in position by means of the insulated pins a, which pass through it and into the bottom plate, a". A large opening is made through the plate m, washer a, and bottom plate, a and the thumb -screw 0, having an insulated sleeve and washer, 0, passes thereth rough and screws into the bottom of the socket m. By this ar rangement it will be seen that all danger of the socket m coming in metallic contact with the plate a is entirely avoided. The plate on is connected to the negative terminal p of the lamp by means of the insulated eonductor p, which is placed within one of the tubular side bars, a One end of the wire of the magnet h is connected to the positive terminal q, and the other end to the insulated guide-bearing q of the rod 0, electrical con nection with the rod being assisted by means of the flexible conductor secured to the guide-bearing q and the rod 0. lVhen the magnets h andj are energized, they each tend to pull their armaturcs opposite thethickest part of their taper-poles, and,as the magnet h is the stronger ot' the two upon the first passage of the current through the lamp, the armature g moves downward, and the clutch d is raised, first gripping the rod 0, and then lifting it, the height to which it is raised to form the are between the carbons being determined by the relative adjustment of the armatures on the lever, and the extreme limit of rise ever desired to be given to the upper carbon may be govered by the adjustment of the stop f on the rod f, said step preventing further movement of the lever b when it comes in contact with the upper side of the tail-piece d of the clutch,as shown at Fig.2. As thearclengthens, the power of the derived magnetj overcomes thit of the magnet h, and so draws down the armaturei and lowers the clutch d and the rod 0 until the stop-nut f comes in contact with the under side of the tail-piece d of the clutch, thus raising it and allowing the'rod c and upper carbon to fall until the are is normal,when the magnet h has again the ascendancy and causes the clutch to grip the rod. By reason of the pivots on which the lever Z) rocks being located on a line between the point of suspension of the link 6 and the carbonholding rod 0, and the adjustment-eontrolling rodf being pivoted to the lever b on the other side of the rod 0, the link 0 and rod fbeing about equidistant from the rod 0, the rodf, with its adj ustable nuts, moves upwardly when the link 0 and clutch (Z move downwardly, but at a much higher rate of speed,due t0 the differences of the respective distances of their points of suspension from the axis of the le ver 6, so that the clutch d is tripped when the link 0 falls a very short distance, and that,to0, in a steady and positive manner, by the nut y, thus enabling the upper carbon to be fed and controlled in a short range of motion, thereby maintaining the are uniform, the lack of which uniformity is the principal objectionable t'eature of electric are lighting. screw 7r, passing through the lever I), is adjusted to come in contact with the insulated top of one of the spools of the magnetj when the stop-nutf opens the clutch to prevent further downward movement of the end of thelev'er I). The armature t has a certain amount of adjustment on the lever Z), to regulate and determine the positions of the armatnres relatively to the taper-poles of their respective n'iagnets. The poles h are opposite the outer side of the armature g, and the poles j are opposite the inner side of the armature t, by which arrangement it will be seen that the direct pull of the magnets on the two armatures is in the same direction, so that their relative distances from the poles remain constant, thus maintaining a uniform (lii'l'ercntial action of the magnets on them alter the lamp is once set and adjusted, whereas it the two pairs of poles were both opposite the inner or the outer sides of the armatures an excess of pull on one of them would, it" there were any play in the bearings of the lever, change the relative positions of the armatures to the taper-poles.

The operating mechanism, instead of being on top of the plate aof the frame, may be placed beneath the same, with the magnets inverted; or the pivoted lever may be actuated by means of one differential horseshoemagnet having curved taper-poles, as shown in Figs. 6 and 7, with a coarse-wire coil, r, on one limb, and a fine-wire coil, 8, on the other limb, acting on an armature, 1, secured to one end of the lever.

What I claim, and desire to secure by Letters Patent, is

1. In an electric-arc lamp, a pivoted frame or lever actuated by means of an electromagnetic device, in combination with an annular clamp supported thereby on one side of its The axis and the carbon rod, and controlled by means of a double-adjusting device carried by the-lever on the opposite side of the axis and the carbon rod, the distance between the. axis of the lever and thelink being much less than that between it and the adjustable controlling device, substantially as and for the purpose set forth.

2. In an electric-arc lamp, in combination, a pivoted frame or lever, a carbon-holding rod passing vertically through it on one side of its axis, an annular clamp having two tailpieces or extensions, by one of which it is suspended from the lever on one side of its axis by means of a link, and a rod having two adjustable stops suspended from the lever on the other side of its axis, the said stops acting on and controlling the free tail-piece of the clamp, one to free the rod and the other to determine the distance it is raised, substantially as and for the purpose set forth.

3. In an electric arc lamp, in combination, a system of electro-magnets having extended polar projections gradually decreasing in thickness toward their free ends, one or more armatures carried by a rocking lever so as to move alongside the polar projections in close proximity thereto, and a clutch suspended from the lever on one side of its axis, with two adjustable stops suspended on the other side of its axis, substantially as and for the purpose set forth. 4

4. The combination of a pivoted frame or lever an d two armatures carried thereby-one on either side of its axiswith two electromagnets arranged with one of their poles opposite the outside face of its armature, and the other opposite the inside face of its armature, thereby applying side strains due to their action always on one side of the bearings of the lever, substantially as set forth.

5. In an electric-arc lamp. two electro-mag nets having curved taper-poles, the conducting-wire of one being in the main circuit, and that of the other in a derived circuit, in combination with two armatures carried by a pivoted frame, the axis of which lies between the two magnets, so that while the armatures maintain a constant distance from the adjacent faces of the poles of their respective magnets the one moves into a field of greater action by approaching the thicker part of its poles as the other moves into a field of lesser action by approaching the thinner part of its poles, substantially as described.

6. In combination, the lower plate, rd, of an electric-lamp frame, the plate at, secured thereto, but insulated therefrom, the lowercarbon socket m, resting on the plate at, and the thumb-screw 0, provided with the insulated washer and sleeve 0, substantially as set forth.

7. The electro-magnets h and j, having curved taper-poles h and j, in combination with the armatures g and t, secured to the ends of the pivoted frame or lever I), substantially as and for the purpose set forth.

8. In combination, the pivoted lever I), earhon-holding rod 0, passing through the lever on one side of its axis, link 6, pivoted to the lever on the side of the axis opposite to that at which the rod is located, clutch d, and rod f, provided with two adjustable stops,f and j, and pivoted to the lever on the same side as that at which the rod 0 passes through it, substantially as and for the purpose set forth.

9. The adjustable stop k, in combination with the pivoted lever b, link 6, clutch d, and adjustable stop f, carried by the rod f, substantially as and for the purpose set forth.

10. In combination, the electro-magnets h and j, the pivoted lever I), provided with the armaturesg and z, the clutch d, suspended from the lover I) by the link 6 at one side of the axis of the lever, the rod f, pivoted to the lever b at the other side of its axis,'an(1 pro vided with the adjustable stop-nutf", and the carbon-holding rod 0, located about midway between the link e and rod f, and passing through the lever between its axis and the rod f, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand, at New York, county and State of New York, this 15th day of February, A. D. 1884.

JOHN M. PENDLETON.

Witnesses:

H. D. WILLIAMs, A. G. HOLCOMB. 

